How to pause the keyboard input? 1

[MrDataGuy]

I have a textbox that number are entered into. I am allowing the user to type a ‘-‘ to reduce the number by one, and ‘+’ to increase it by one. (In the Keyup method there is code looking for e.KeyCode = Keys.Subtract and = Keys.Add). The code does more then adding or subtracting but that is a side issues. What I am finding is that sometimes the user presses down on the ‘+’ or ‘-‘ keys to do rapid changes and the code crashes because it is trying to process ‘+++++++’ or ‘-------‘ etc.

I can try and handle this situation in several ways, but I am wondering if there is a command that pauses the keyboard processing, or puts the text in a buffer so the code can be handled in a reasonable way.

Any ideas? Suggestions?


Lion Crest Software Services
Anthony L. Testi
President

http://www.LionCrestSoftwareServices.com

 

[DaveInIowa]

Sounds like you would like to intercept and process the plus and minus keys before they get to the textbox.

    Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
        If (e.KeyChar = "-"c OrElse e.KeyChar = "+"c) Then
            e.Handled = True '<- This is what keeps it being sent to the textbox
            ' Add or subtract to the textbox value here
        End If
    End Sub

 

[MrDataGuy]

Dave
Short response: THANK YOU; you gave me the perfect answer, take a bow and give yourself a high five.

Long response:
I started this code sometime ago and copied an example of what I needed (Trapping and dealing with keystrokes, not the specific incrementing and decrementing stuff) and have modified it since. I looked at your example code and saw the e.Handled command. I said to myself well that is of no help the code already does that. Then I did a 2nd look and then thought that maybe the e.Handled was needed in the Keyup method, when I had it in the KeyDown method. Looking at your example a 3rd time I realized that you were using the (unknown to me) Keypress method. Hmmm it is starting to get interesting. I looked at the keypress method and modified my code to use that instead of the KeyUp and Keydown methods and it all works like a charm. So I learned something today! Thanks again!


Lion Crest Software Services
Anthony L. Testi
President

http://www.LionCrestSoftwareServices.com

 

[Andrzejek]

Just curious,

What does this 'c' do next to "-" or "+" sign in the code?


Have fun.

---- Andy

 

[Borvik]

That means that the previous string should be interpreted as a Char type rather than a string.